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Interesting math in grade three:
The ages of the three people are

1250×3=3750

The total age of blue and green is

1200×2=2400

What is the age of red?

3750-2400= 1350

The total age of red and green is

1330×2=2660

The green age is

2660- 1350= 13 10

The age of the basket is

2400- 13 10= 1090

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